Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0220837da1323e7…

MALICIOUS

PDF

72.4 KB Created: 2021-05-06 17:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 83652fb6cd892478e7f99f5047eab350 SHA-1: afac49ccb8e3d813c0e8409f1849c136c2655d20 SHA-256: b0220837da1323e7853bd5588976ffd056e1d28772e125c0b7adcdebbdf6d203
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. One prominent URL, 'https://dugedepap.ru/strik?utm_term=continuum+mechanics+of+solids', suggests a potential phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=continuum+mechanics+of+solids PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe4ea5acf285.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/ee75b7a4dcb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_600adedd1785e.pdfIn PDF document text
    • http://weareanonymous.org/3_bedroom_house_plans_and_pictureslil95.pdfIn PDF document text
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/sepirisesazej-xiperilizab-sunasekifa-gemivopexo.pdfIn PDF document text
    • http://ketadiets.site/how_to_use_trig_functions_on_ti_36x_pron1ewd.pdfIn PDF document text
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/nagefodarejewunud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_605ff971c7180.pdfIn PDF document text
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/9d558fc117f.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/ba086e557a5a.pdfIn PDF document text
    • http://batmbatm.ru/busogopacbvqo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_600fa480883bf.pdfIn PDF document text
    • http://trysalon.xyz/54782051395350u.pdfIn PDF document text
    • http://catsism.com/introduction_to_law_enforcementfn82m.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/61f02.pdfIn PDF document text
    • http://eurozone.pro/vinosuvomasiectjq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_60697122ea437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_ac8bf15cdfbd40b0858421887d8139b1.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_17a3c5a25cab4eedb3fed43ac3ecef00.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 5068 bytes
SHA-256: fe890b7045511520c993fb78c608082c36d330373258747a8501ee7b39ab7e70
font_01_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 11652 bytes
SHA-256: 3a145e3afa96f0e7d75d17857901e49d59ae036fbbdf42e1e4a0de5957ec2d56

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